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The Greatest of All Protestant “Heresies”

Let us begin with a church history exam question. Cardinal Robert Bellarmine (1542–1621) was a figure not to be taken lightly. He was Pope Clement VIII’s personal theologian and one of the most able figures in the Counter-Reformation movement within sixteenth-century Roman Catholicism. On one occasion, he wrote: “The greatest of all Protestant heresies is _______ .”

How would you answer? What is the greatest of all Protestant heresies? Perhaps justification by faith? Perhaps Scripture alone, or one of the other Reformation watchwords?

Those answers make logical sense. But none of them completes Bellarmine’s sentence. What he wrote was: “The greatest of all Protestant heresies is assurance.”

A moment’s reflection explains why. If justification is not by faith alone, in Christ alone, by grace alone — if faith needs to be completed by works; if Christ’s work is somehow repeated; if grace is not free and sovereign, then something always needs to be done, to be “added” for final justification to be ours. That is exactly the problem. If final justification is dependent on something we have to complete it is not possible to enjoy assurance of salvation. For then, theologically, final justification is contingent and uncertain, and it is impossible for anyone (apart from special revelation, Rome conceded) to be sure of salvation. But if Christ has done everything, if justification is by grace, without contributory works; it is received by faith’s empty hands — then assurance, even “full assurance” is possible for every believer.

No wonder Bellarmine thought full, free, unfettered grace was dangerous! No wonder the Reformers loved the letter to the Hebrews!

This is why, as the author of Hebrews pauses for breath at the climax of his exposition of Christ’s work (Heb. 10:18), he continues his argument with a Paul-like “therefore” (Heb. 10:19). He then urges us to “draw near … in full assurance of faith” (Heb. 10:22). We do not need to re-read the whole letter to see the logical power of his “therefore.” Christ is our High Priest; our hearts have been sprinkled clean from an evil conscience just as our bodies have been washed with pure water (v.22).

Christ has once-for-all become the sacrifice for our sins, and has been raised and vindicated in the power of an indestructible life as our representative priest. By faith in Him, we are as righteous before the throne of God as He is righteous. For we are justified in His righteousness, His justification alone is ours! And we can no more lose this justification than He can fall from heaven. Thus our justification does not need to be completed any more than does Christ’s!

With this in view, the author says, “by one offering He has perfected for all time those who come to God by him” (Heb. 10:14). The reason we can stand before God in full assurance is because we now experience our “hearts sprinkled clean from an evil conscience and … bodies washed with pure water” (Heb. 10:22).

“Ah,” retorted Cardinal Bellarmine’s Rome, “teach this and those who believe it will live in license and antinomianism.” But listen instead to the logic of Hebrews. Enjoying this assurance leads to four things: First, an unwavering faithfulness to our confession of faith in Jesus Christ alone as our hope (v.23); second, a careful consideration of how we can encourage each other to “love and good works” (v.24); third, an ongoing communion with other Christians in worship and every aspect of our fellowship (v.25a); fourth, a life in which we exhort one another to keep looking to Christ and to be faithful to him, as the time of his return draws ever nearer (25b).

It is the good tree that produces good fruit, not the other way round. We are not saved by works; we are saved for works. In fact we are God’s workmanship at work (Eph. 2:9–10)! Thus, rather than lead to a life of moral and spiritual indifference, the once-for-all work of Jesus Christ and the full-assurance faith it produces, provides believers with the most powerful impetus to live for God’s glory and pleasure. Furthermore, this full assurance is rooted in the fact that God Himself has done all this for us. He has revealed His heart to us in Christ. The Father does not require the death of Christ to persuade Him to love us. Christ died because the Father loves us (John 3:16). He does not lurk behind His Son with sinister intent wishing He could do us ill — were it not for the sacrifice his Son had made! No, a thousand times no! — the Father Himself loves us in the love of the Son and the love of the Spirit.

Those who enjoy such assurance do not go to the saints or to Mary. Those who look only to Jesus need look nowhere else. In Him we enjoy full assurance of salvation. The greatest of all heresies? If heresy, let me enjoy this most blessed of “heresies”! For it is God’s own truth and grace!